GreedyMesher.h

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#pragma once
 
#include "voxel/CubeTypeRegistry.h"
#include "voxel/FaceDir.h"
#include "voxel/VoxelPack.h"
 
#include <cstdint>
#include <vector>
 
namespace eve::voxel {
 
using ChunkSampler = uint8_t (*)(void *userData, int chunkX, int chunkY, int chunkZ,
                                 int localX, int localY, int localZ);
 
class GreedyMesher {
public:
    static void meshChunk(const uint8_t *voxels, std::vector<PackedRect> outFaces[6],
                          const CubeTypeRegistry &types = CubeTypeRegistry::empty(),
                          ChunkSampler sampler = nullptr, void *samplerUserData = nullptr,
                          int chunkX = 0, int chunkY = 0, int chunkZ = 0,
                          std::vector<uint32_t> aoOut[6] = nullptr);
 
    static void meshFace(const uint8_t *voxels, FaceDir dir, std::vector<PackedRect> &out,
                         const CubeTypeRegistry &types = CubeTypeRegistry::empty(),
                         ChunkSampler sampler = nullptr, void *samplerUserData = nullptr,
                         int chunkX = 0, int chunkY = 0, int chunkZ = 0,
                         std::vector<uint32_t> *aoOut = nullptr);
 
private:
    static uint8_t at(const uint8_t *v, int x, int y, int z);
    static uint8_t neighborAt(const uint8_t *voxels, ChunkSampler sampler, void *userData,
                              int chunkX, int chunkY, int chunkZ, int nx, int ny, int nz);
    static uint8_t outsideVoxel(const uint8_t *voxels, ChunkSampler sampler, void *userData,
                                int chunkX, int chunkY, int chunkZ, FaceDir dir, int slice,
                                int gu, int gv);
    static uint8_t vertexAO(const uint8_t *voxels, ChunkSampler sampler, void *userData,
                            int chunkX, int chunkY, int chunkZ, FaceDir dir, int slice, int gu,
                            int gv);
    static uint32_t rectAOWord(const uint8_t *voxels, ChunkSampler sampler, void *userData,
                               int chunkX, int chunkY, int chunkZ, FaceDir dir, int slice, int x,
                               int y, int z, int w, int h);
    static bool isSolid(uint8_t id) { return id != 0; }
    static void greedy2D(int mask[kChunkSize][kChunkSize], FaceDir dir, int slice,
                         std::vector<PackedRect> &out, std::vector<uint32_t> *aoOut,
                         const uint8_t *voxels, ChunkSampler sampler, void *userData,
                         int chunkX, int chunkY, int chunkZ);
};
 
}  // namespace eve::voxel